steel catenary risers installation
Post on 04-Jun-2018
272 Views
Preview:
TRANSCRIPT
-
8/13/2019 Steel catenary risers installation
1/30
Deep Water Installation of SteelCatenary Risers
Subsea Asia
3rdOctober, 2012
Kuala Lumpur, Malaysia
Grant Milne
-
8/13/2019 Steel catenary risers installation
2/30
Safety Moment Abseiling for SCR Installation
Used On Erha. SCR receptacleslocated above the waterline
High standard of procedures Early involvement of the abseiling
supervisor in the project
-
2Page2-Oct-12
department as well assubcontractors.
-
8/13/2019 Steel catenary risers installation
3/30
Agenda
Introduction
SCR Configurations
SCR Welding
Deepwater SCR Installation
3Page2-Oct-12
SCR Hook-upBC-10 Experience
-
8/13/2019 Steel catenary risers installation
4/30
Introduction to Steel Catenary Risers
Steel Catenary Risers:
Economically attractive
Large diameters
High resistance to internal and externalpressure
Simple and robust installation methods
4Page2-Oct-12
Sensitive to dynamics and morevulnerable to fatigue when they are lightin water
Challenges: Increasing top tensions due to larger
diameters and deeper water
Increase of fatigue due to harsherenvironments, and increasing top tensions
-
8/13/2019 Steel catenary risers installation
5/30
Agenda
Introduction
SCR ConfigurationsSCR Welding
Deepwater SCR Installation
5Page2-Oct-12 5Page2-Oct-12
SCR Hook-upBC-10 Experience
-
8/13/2019 Steel catenary risers installation
6/30
SCR Configurations For Minimised Fatigue
Three configurations to choose from are:
Free hanging SCR
Lazy wave SCR
Buoyancy supported riser
Influenced by:
Water depth
6Page2-Oct-12
Environmental conditions Installation method
SCR size and design
Top tension
Fatigue allowances Type of production platform
-
8/13/2019 Steel catenary risers installation
7/30
SCR Configurations Free Hanging SCR
Simple and easy installation
Often installed VIV strakes
Economically attractive Can be subject to high
fatigue damage at top endand TDP
7Page2-Oct-12
Sometimes need hold-backanchors:
-
8/13/2019 Steel catenary risers installation
8/30
SCR Configurations Lazy Wave SCR
Addition of buoyancymodules
Decreased top tension
TDP is further away fromproduction facility
Lower Stress and Fatigue at
8Page2-Oct-12
the Top End and TDP byfactors of between 2 and 5
Completed for BC-10, 2009
-
8/13/2019 Steel catenary risers installation
9/30
SCR Configurations Buoyancy Supported Risers
De-couple FPSO motionsfrom risers
Effectively decreased toptension at FPSO or floatingstructure
Easier SCR installation
9Page2-Oct-12
program: De-coupled from FPSO
Completed without FPSO infield
Suited to ultra deep water
Guara Lula project Brazil2013/2014
-
8/13/2019 Steel catenary risers installation
10/30
Agenda
Introduction
SCR ConfigurationsSCR Welding
Deepwater SCR Installation
10Page2-Oct-12 10Page2-Oct-12
SCR Hook-upBC-10 Experience
-
8/13/2019 Steel catenary risers installation
11/30
SCR Welding for Improved Fatigue Performance
Fatigue performance of weld is critical
Close control of pipe end tolerances and joint misalignment
High integrity weld procedures Flush grinding of weld caps for better fatigue performance
Reel lay installation onshore fabrication and testing
11Page2-Oct-12
-
8/13/2019 Steel catenary risers installation
12/30
SCR Welding Installation of Mechanically Lined
Clad Pipe for Reel Lay
Subsea7 has developed a methodology for the installationof mechanically lined pipe by reel lay.
Qualification gained from DNV and the method will be usedon Guara-Lula, 2013 for the SCR installation
Methodology adopts reeling on the lined pipe in a floodedcondition with back pressure to mitigate any wrinkling of
12Page2-Oct-12
the CRA liner due to plastic bending Method offers significant economic advantages due to the
reduced cost from using metallurically clad pipe which hasbeen previously reeled
-
8/13/2019 Steel catenary risers installation
13/30
SCR Fabrication Prefabrication Onshore
Vigra spool base in Norway
Maximum stalk length of 1520m
1000m fabrication shed
13Page2-Oct-12
-
8/13/2019 Steel catenary risers installation
14/30
SCR Fabrication Prefabrication Onshore Pipeline stalks are fabricated first and then spooled onto
reel lay vessel; Seven Navica
14Page2-Oct-12
SCRs can also be installed by offshore fabrication in S-Layand J-Lay
-
8/13/2019 Steel catenary risers installation
15/30
Agenda
Introduction
SCR ConfigurationsSCR Fabrication
Deepwater SCR Installation
15Page2-Oct-12 15Page2-Oct-12
SCR Hook-upBC-10 Experience
-
8/13/2019 Steel catenary risers installation
16/30
Deepwater Installation Spread Seven Borealis
Seven Borealis Size: 182m x 46m
J-Lay: 937Te, 24
S-Lay: 600Te, 46
Crane: 5000Te
16Page2-Oct-12
15 gimble capacity allowsvessel to fully weathervanein order to minimise motionsand SCR fatigue.
Suited for the installation ofthe biggest SCRs in ultra-deepwater environments
-
8/13/2019 Steel catenary risers installation
17/30
Deep Water Installation Spread Sapura 3000
Sapura 3000
Size: 151m x 38m
J-lay: 400Te, 20
S-lay: 240Te, 60
17Page2-Oct-12
Class leading heavy lift andpipelay vessel operating in
water depths of up to3000m
-
8/13/2019 Steel catenary risers installation
18/30
Deepwater Installation Spread Seven Oceans
Seven Oceans
Size: 157m x 28m
Reel Lay: 3500Te
Pipe Size: 6-16
18Page2-Oct-12
Efficient reel lay vessel withSCR experience
-
8/13/2019 Steel catenary risers installation
19/30
Deepwater Installation Spread
Seven Seas
Construction and flex-lay
vessel with J-lay capabilitiesthrough the moonpool
Top tension: 400Te
19Page2-Oct-12
-
8/13/2019 Steel catenary risers installation
20/30
Deepwater Installation Spread Weather Mitigation J-Lay: 15 gimble to allow 360 heading changes
Larger vessels: smaller motions
Reel lay: small installation window needed due to quick layspeeds
Moonpool lay decreases vessel motions seen by SCR.
20Page2-Oct-12
-
8/13/2019 Steel catenary risers installation
21/30
Agenda
Introduction
SCR ConfigurationsSCR Welding
Deepwater SCR Installation
21Page2-Oct-12 21Page2-Oct-12
SCR Hook-up
BC-10 Experience
-
8/13/2019 Steel catenary risers installation
22/30
SCR Hook-up SCR Wet Store De-couple SCR fabrication
and installation with FPSOdelivery
Tight corridors
Additional vessel to recoverand transfer SCR to FPSO
22Page2-Oct-12
Pull-in head and laydowntool installation
-
8/13/2019 Steel catenary risers installation
23/30
SCR Hook-up Direct Transfer From pipelay vessel to FPSO
Historically preferred method
Deploy SCR on A&R winchfrom pipelay vessel andhandover subsea to FPSOpull-in wire
23Page2-Oct-12
-
8/13/2019 Steel catenary risers installation
24/30
SCR Hook-up Riser Pull-in Equipment (RPE) Located on FPSO to
complete final pull-in of SCR
Up to 450Te has been
completed, 600Te in thefuture
Slides between riser
24Page2-Oct-12
recep ac es
De-mobilised off FPSO afterhook-up.
-
8/13/2019 Steel catenary risers installation
25/30
Agenda
Introduction
SCR ConfigurationsSCR Welding
Deepwater SCR Installation
25Page2-Oct-12 25Page2-Oct-12
SCR Hook-up
BC-10 Experience
-
8/13/2019 Steel catenary risers installation
26/30
Shell BC-10 Overview Brazil Campos Basin
Harsh environmental conditions
1190-1940m WD
2009
Reel lay Seven Oceans Ubu spool base
26Page2-Oct-12
Lazy Wave SCR Improved fatigue life
Reduced top tension andreduced loads on FPSO turret
FPSO motions affect the SCR
less.
3 SCRs were wet stored and2 were directly transferred.
-
8/13/2019 Steel catenary risers installation
27/30
Shell BC-10 Buoyancy Modules Installed after the initiation
of the PLET.
Installed under lay spread
on Seven Oceans.
Half shells of buoyancy wereheavy and large.
27Page2-Oct-12
Operation completed withoutincident.
Fatigue performance for SCRare very good.
-
8/13/2019 Steel catenary risers installation
28/30
Shell BC-10 Flexjoint Weld SCR hung off in worktable.
Flexjoint lifted into layspread by vessel crane.
Flexjoint section manuallywelded onto SCR.
J-lay methodology
28Page2-Oct-12
-
8/13/2019 Steel catenary risers installation
29/30
Conclusion Selection of the best SCR configuration
Lazy Wave for decreased top tension and lower fatigue
Free hanging for simplicity
Buoyancy supported riser for ultra deep water
Selection of a vessel to minimise installation fatigue loads
Reel lay for minimal installation time
29Page2-Oct-12
J-lay for high top tension and 360 heading changes
S-lay
Wet-store or direct transfer
De-couple installation schedule from FPSO delivery
Pull-in and landing of SCR into receptacle on floatingstructure
-
8/13/2019 Steel catenary risers installation
30/30
10.01.11 30Page
seabed-to-surface
www.subsea7.com
top related